EP0227251A2 - Druckkopf-Bewegungsapparat - Google Patents

Druckkopf-Bewegungsapparat Download PDF

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Publication number
EP0227251A2
EP0227251A2 EP86308241A EP86308241A EP0227251A2 EP 0227251 A2 EP0227251 A2 EP 0227251A2 EP 86308241 A EP86308241 A EP 86308241A EP 86308241 A EP86308241 A EP 86308241A EP 0227251 A2 EP0227251 A2 EP 0227251A2
Authority
EP
European Patent Office
Prior art keywords
band
differential wheel
carriage
diameter
path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86308241A
Other languages
English (en)
French (fr)
Other versions
EP0227251A3 (en
EP0227251B1 (de
Inventor
Robert Gracie Bradford
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unisys Corp
Original Assignee
Burroughs Corp
Unisys Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Burroughs Corp, Unisys Corp filed Critical Burroughs Corp
Publication of EP0227251A2 publication Critical patent/EP0227251A2/de
Publication of EP0227251A3 publication Critical patent/EP0227251A3/en
Application granted granted Critical
Publication of EP0227251B1 publication Critical patent/EP0227251B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/005—Cable or belt constructions for driving print, type or paper-carriages, e.g. attachment, tensioning means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/188—Reciprocating or oscillating to or from alternating rotary including spur gear
    • Y10T74/18808—Reciprocating or oscillating to or from alternating rotary including spur gear with rack
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18832—Reciprocating or oscillating to or from alternating rotary including flexible drive connector [e.g., belt, chain, strand, etc.]
    • Y10T74/18848—Reciprocating or oscillating to or from alternating rotary including flexible drive connector [e.g., belt, chain, strand, etc.] with pulley

Definitions

  • the present invention relates to an apparatus for transporting a carriage along a path.
  • the invention particularly relates to such an apparatus used to transport a printhead along a line whereon characters are to be printed in a typewriter or printer.
  • the printhead In use the printhead is transported along the line of print such that adjacent characters printed on the paper are properly spaced apart.
  • This transportation of the printhead in the prior art, is achieved by means of belts, leadscrews, wires and other devices linked to a printhead carriage constrained by tracks, sliders and other means to move along the printing path.
  • the distance moved by the printhead between successive printing operations is small, and in consequence the quality of the drive mechanism for the printhead carriage is required to be high.
  • stepping motors to drive the belts or wire, in which instance it is necessary for the stepping motors to be of high quality and accuracy, and to have many steps of angular position in each full rotation.
  • These prior art solutions have the further disadvantage that the quality of the mechanical parts is required to be extremely high since drive from a motor is applied more or less directly to the printhead carriage.
  • the present invention seeks to improve over the prior art by providing a printhead carriage which is driven along the printing path using a principle of differential motion whereby gross movements in a wire, belt or rack cause only a small linear displacement of the carriage allowing coarse and relatively imprecise mechanical parts to be employed.
  • the present invention further seeks to provide improvement over the prior art by allowing for the motor which moves the printhead to be selectably mounted either on the printhead itself or on the body of the printer thereby making for a compact construction.
  • the present invention consists in a carriage transport apparatus wherein a carriage is constrained to move in a predetermined path, said apparatus including a first portion of band, movable in a first direction relative to said path and operative in response thereto to impart relative movement between itself and said carriage in a first direction sense along said path; and a second portion of band simultaneously movable with said first portion of band by the same distance in a second direction relative to said path and opposed to said first direction and operative in response thereto to impart relative movement between itself and said carriage in a second directional sense opposed to said first directional sense along said path, for said carriage to be displaced in said path by the difference between said relative movement in said first directional sense and said relative movement in said second directional sense.
  • a differential wheel has a first portion of a endless band looped round a first portion having a first radius of the differential wheel and has a second portion of an endless band wrapped around a portion of itself on the second radius.
  • the band passes around spaced pulleys, one of the pulleys being an idler pulley and the other a driven pulley.
  • the differential wheel itself is attached to a carriage bracket constrained to move along the printing path.
  • a coarse stepping motor drives the driven pulley and the action of the differential wheel ensures that gross rotation of the driven pulley reduces only small linear displace­ment in the carriage bracket.
  • the stepping motor driving the carriage transport apparatus is mounted on the carriage bracket itself and rotates the differential wheel.
  • the endless band is supported now between two idler pulleys and as the differential wheel pays the endless band on and off itself the carriage bracket moves along its printing path by a relatively small displacement for gross angular displacement of the differential wheel.
  • the endless band which previously was wrapped around a portion of the differential wheel, is replaced by a toothed timing belt engaging only tangentially with toothed portions of the differential wheel and passing around support pulleys in the same manner as for the endless band.
  • the endless band is replaced by solid racks once again tangentially engaging portions of different radii on the differential wheel.
  • the racks are constrained to move in opposite directions by equal amount by means of a transfer roller held therebetween.
  • FIG.l shows a projected view of the first preferred embodiment of the present invention.
  • a printhead carriage in a typewriter or other electro-mechanical printer is constrained to move along a guide rod l2 by a sleeve l4 sliding on the guide rod l2 to allow movement of the printhead carriage along a line of printing as indicated by a first arrow l6.
  • the printhead carriage l0 is shown here as being supported on a guide rod l2 only by way of example. Those skilled in the art will be aware that it is equally possible in the present invention to guide the printhead carriage l0 by tracks, groves and linear races.
  • the printhead carriage l0 is provided in the form of a bracket whereon a differential wheel l8 is mounted to rotate.
  • FIG.l shows the first preferred embodiment in partially exploded form.
  • the differential wheel l8 comprises an axle 20 for mounting through an opening 22 in the printhead carriage.
  • the differential wheel l8 may be rotatably fixed to the printhead carriage l0 in any manner known in the art and the method here given is by way of example.
  • An endless belt or band 24 is wrapped in a manner later to be described around the differential wheel l8, and is supported at its extremities by an idler pulley 26 which is free to rotate without opposition and by a driven pulley 28 rotated by a motor 30.
  • FIG.2 shows a cross-sectional view of the differential wheel l8 of FIG.l.
  • the wheel comprises a first circular portion 32 of a first diameter and a second portion 34 of a second diameter less than the first diameter.
  • Optional guard rings 36 extend beyond the first 32 and the second 34 portion diameters of the differential wheel l8 to prevent the endless belt 24 from slipping off the differential wheel l8.
  • FIG.3 shows how the endless belt 24 is passed around the differential wheel l8. Here all elements except the endless belt 24 are omitted for clarity.
  • a first portion 38 of the endless belt or band 24 passes around the first portion 32 of the differential wheel l8 in a first loop 40 and a second portion 42 of the endless belt or band 24 passes in a second loop 44 about the second portion 34 of the differential wheel l8.
  • the motor 30 rotates the driven pulley 28 so the belt or band 24 is paid out towards and back from the idler pulley 26 which ensures that the movements of the first and second portions 38,42 of the belt are equal and opposite with regard to the overall apparatus (as exemplified by the guide rod l2).
  • the first loop 40 passing around the first portion 32 of the differential wheel l8 causes rotation of the differential wheel l8 which in turn is accompanied by the first portion 32 of the differential wheel rolling along the first portion 38 of the belt 24 by a first distance.
  • the actual movements relative to the belt 24 of the first and second portions 32,34 of the differential wheel are to a large part cancelled by virtue of the movement in opposite directions as indicated by the second and third arrows 46,48 of the belt or band 24.
  • the residual movement of the differential wheel l8 is caused to be the difference between the distance rolled along the first portion 38 of the belt or band 24 and the distance rolled along the second portion 42 of the belt or band 24.
  • the residual movement is coupled by the axle 20 to the printhead carriage l0 which in turn is constrained to move by the residual motion linearly along the guide rod l2.
  • the motor 30 may be made as coarse as is desired for reasons of economy or control.
  • the diameters of the first and second portions 32,34 are made exactly equal, no movement may be induced in the printhead carriage l0 no matter how many revolutions the driven pulley 28 may make.
  • the motor 30 may thereby be caused to require to impart multiple revolutions to the driven pulley 28 in order to move the carriage l0 along the rod l2 by just one character printing space. This is in marked contrast to the prior art where such a motor or motor/gearbox assembly would be required to execute only a tiny precise fraction of a revolution.
  • the motor 30 can be replaced by solenoids, ratchet devices and other coarse mechanisms which would otherwise be unacceptable in such an application. All that is required of the motor device 30 is that it is capable of rotating the driven pulley 28 by a controlled amount.
  • first 40 and second 44 loops have been shown as consisting solely in a single turn, it is to be appreciated that the loops 40,44 may comprise more than one turn.
  • the loops 40,44 are shown as having been wound in a particular sense or direction of winding around the first and second portions 32,34 of the differential wheel l8, all that is required in the sense of winding is that when the belt or band moves as indicated by the second 46 and third 48 arrows, both loops 40,44 tend to urge the differential wheel l8 to rotate in the same rotational direction.
  • FIG.4 shows a second preferred embodiment of the invention.
  • the motor 30 has been moved from the body or chassis of the printing mechanism (as shown in FIG.l) onto the printhead carriage l0 itself and the motor 30 is mounted to rotate the differential wheel l8.
  • the endless belt or band 24 is held at its extremities between a pair of support pulleys 50 which are both idler pulleys and which serve to ensure that motion of one portion 38 of the band 24 is countered by equal and opposite motion of the second portion 42 of the band 24.
  • FIG.5 shows a third preferred embodiment of the invention where the endless band or belt 24 is replaced by a toothed endless timing belt or band having a first portion 52 in tangential engagement with a first toothed portion 54 of a differential gearwheel 56 and a second portion 58 in tangential engagement with a second toothed portion 60 of the differential gearhweel 56.
  • Rollers 62 are urged as indicated by fourth 64 and fifth 66 arrows to thrust the first 52 and second 58 portions of the endless timing belt respectively on to their first 54 and second 56 toothed portions of the differential gearwheel 56.
  • the differential gearwheel 56 is mounted upon the printhead carriage in the same manner shown for the first embodiment of FIG.l and the second embodiment of FIG.4.
  • the endless toothed timing belt 52,58 may pass either around an idler pulley 26 and driven pulley 28 arrangement as illustrated in FIG.l or may pass around a pair of support pulleys 50 as illustrated in FIG.4.
  • FIG.6 shows a fourth preferred embodiment of the invention where the endless belt 24 or the endless toothed belt 52,58 is replaced by a pair of rigid racks. Whilst FIG.6 shows the racks 68,70 as being smooth it is to be understood that they may equally well be toothed and engage a differential wheel 72 substantially identical to the differential gearwheel 56 shown In FIG.5.
  • the racks 68,70 move as indicated by sixth and seventh arrows 74,76 and a transfer roller 78 is fixed between the first and second rigid racks 68,70 to ensure that movement of a first rack 68 is transferred as equal and opposite movement to the second rack 70.
  • the racks 68,70 roll against the differential wheel 72 in the manner described for the third embodiment of FIG.5. Either one of the racks may be driven or indeed, the differential wheel 72 may be the source of motive power.
  • the presence of the transfer roller 78 ensures that the two racks 68,70 co-operate to move the printhead carriage l0 in the same manner as does the endless belt 24 and the endless toothed belt 52,58.
  • the present invention also allows for a rapid carriage return stroke to be imparted to the printhead carriage by disengagement of the rack or belts from one part of the differential wheel.
  • one of the rollers 62 is moved away from its respective portion of the endless timing belt 52,58 allowing that portion of the timing belt to disengage from its portion 54,60 of the differential gearwheel 56.
  • the motor 30 is mounted as shown in the second embodiment of FIG.4, the remaining toothed portion 54,60 of the differential gearhweel 56 engages only one half of the toothed belt 52,58 and the carriage l0 is moved along that portion, when the portion is held immobile, at high speed.
  • the removal of one of the portions 52,58 of the endless toothed timing belt from the differential gearwheel 56 is accompanied by clamping of one of the support pulleys 50 to immobilise the belt 52,58.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
EP86308241A 1985-11-30 1986-10-23 Druckkopf-Bewegungsapparat Expired - Lifetime EP0227251B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8529522A GB2183771B (en) 1985-11-30 1985-11-30 Printhead transport apparatus
GB8529522 1985-11-30

Publications (3)

Publication Number Publication Date
EP0227251A2 true EP0227251A2 (de) 1987-07-01
EP0227251A3 EP0227251A3 (en) 1988-02-03
EP0227251B1 EP0227251B1 (de) 1990-03-21

Family

ID=10589043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86308241A Expired - Lifetime EP0227251B1 (de) 1985-11-30 1986-10-23 Druckkopf-Bewegungsapparat

Country Status (5)

Country Link
US (1) US4804285A (de)
EP (1) EP0227251B1 (de)
JP (1) JPS62196166A (de)
DE (1) DE3669688D1 (de)
GB (1) GB2183771B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008122762A1 (en) * 2007-04-05 2008-10-16 Premium Aircraft Interiors Uk Limited Movable furniture
ITUB20154785A1 (it) * 2015-11-03 2017-05-03 Panotec Srl Apparato per la movimentazione controllata di unita'di stampa e macchina per la produzione di imballi incorporante tale apparato

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4889438A (en) * 1989-04-12 1989-12-26 Royden C. Sanders, Jr. Serial printer carriage drive with ballistic rebound reversal
DE4226292C2 (de) * 1991-08-06 1994-10-13 Erhard Kosch Antriebsvorrichtung für die Umwandlung drehender Bewegungen in lineare Bewegungen und umgekehrt
DE4230546A1 (de) * 1992-09-09 1994-03-10 Cybertron Ges Fuer Elektronik Vorrichtung zur Umsetzung einer Drehbewegung in eine Linearbewegung
US5564309A (en) * 1992-12-02 1996-10-15 Matsushita Electric Industrial Co., Ltd. Rectilinear motion apparatus
US5884427A (en) * 1996-07-30 1999-03-23 Lenz; Eric D. Movement assembly for use with animal decoy
US6134978A (en) * 1997-11-13 2000-10-24 Lin; Bob Transmission mechanism for a scanner
ES2182190T3 (es) * 1998-07-16 2003-03-01 Hewlett Packard Co Dispositivo de impulsion por correa.
GB2389886B (en) * 2003-07-28 2005-08-17 Savvas Hadjixenofontos A mechanism for the transmission of reciprocating motion of variable amplitude into undirectional circular motion
US7134736B2 (en) * 2004-01-08 2006-11-14 Fuji Xerox Co., Ltd. Printer with printhead fully traveling around drive belt loop
GB2435315B (en) * 2006-02-15 2010-10-06 Thales Holdings Uk Plc Rotary to linear transmission
US10018256B1 (en) * 2012-10-29 2018-07-10 X Development Llc Low cost block and tackle robot transmission
WO2015013501A1 (en) * 2013-07-25 2015-01-29 Liftwave, Inc. Dba Rise Robotics Differential conical drive
CN105035731A (zh) * 2015-06-30 2015-11-11 贵州慧联科技有限公司 一种等差变距抓取机构及其变距方法
JP7473433B2 (ja) * 2020-09-17 2024-04-23 株式会社Ｓｃｒｅｅｎホールディングス 移動装置、移動方法および印刷装置
JP2022123998A (ja) 2021-02-15 2022-08-25 セイコーエプソン株式会社 記録装置
US20230279928A1 (en) * 2022-03-02 2023-09-07 Mechanomy LLC Single continua differential pulley transmission

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Publication number Priority date Publication date Assignee Title
US3926061A (en) * 1974-10-02 1975-12-16 Hewlett Packard Co Differential drive rotating disc impact printer
US3991873A (en) * 1975-06-11 1976-11-16 Hewlett-Packard Company Attaching print disc to drive in impact printers
DE2935727A1 (de) * 1978-09-05 1980-03-13 Canon Kk Drucker

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US396430A (en) * 1889-01-22 Helm reichel
US2571427A (en) * 1945-11-19 1951-10-16 Myron J Drachman Differential mechanism
US2844788A (en) * 1955-04-18 1958-07-22 Budd Co Magnetic sheet detecting means
NL129819C (de) * 1963-12-06
US3270572A (en) * 1964-10-01 1966-09-06 Gen Motors Corp Door operating mechanism
DE2039199C3 (de) * 1970-08-06 1974-05-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Einrichtung zum Erzeugen einer Relativbewegung zwischen Druckorgan und Aufzeichnungsträger
JPS5532622A (en) * 1978-08-31 1980-03-07 Ricoh Co Ltd Carriage driving device for printer
JPS5541204A (en) * 1978-09-18 1980-03-24 Ricoh Co Ltd Carriage drive gear for printer
EP0016995B1 (de) * 1979-03-30 1984-08-22 Ascom Autelca Ag Antriebs- und Führungsvorrichtung für einen Nadelkopf eines Nadeldruckers
JPS5887057A (ja) * 1981-11-20 1983-05-24 Canon Electronics Inc プリンタ
JPS58107379A (ja) * 1981-12-21 1983-06-27 Citizen Watch Co Ltd プリンタの活字輪駆動装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926061A (en) * 1974-10-02 1975-12-16 Hewlett Packard Co Differential drive rotating disc impact printer
US3991873A (en) * 1975-06-11 1976-11-16 Hewlett-Packard Company Attaching print disc to drive in impact printers
DE2935727A1 (de) * 1978-09-05 1980-03-13 Canon Kk Drucker

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008122762A1 (en) * 2007-04-05 2008-10-16 Premium Aircraft Interiors Uk Limited Movable furniture
GB2460205A (en) * 2007-04-05 2009-11-25 Premium Aircraft Interiors Uk Movable furniture
US8485470B2 (en) 2007-04-05 2013-07-16 Zodiac Seats Uk Limited Movable seat
ITUB20154785A1 (it) * 2015-11-03 2017-05-03 Panotec Srl Apparato per la movimentazione controllata di unita'di stampa e macchina per la produzione di imballi incorporante tale apparato
WO2017077439A1 (en) * 2015-11-03 2017-05-11 Panotec S.R.L. Apparatus for controlled motion of printing units and package making machine incorporating such apparatus
CN108367577A (zh) * 2015-11-03 2018-08-03 泛诺泰有限责任公司 用于印刷单元的受控运动的装置和包括该装置的包装制造机器
CN108367577B (zh) * 2015-11-03 2020-02-18 泛诺泰有限责任公司 用于印刷单元的受控运动的装置和包括该装置的机器
US10870296B2 (en) 2015-11-03 2020-12-22 Panotec S.R.L. Apparatus for controlled motion of printing units and package making machine incorporating such apparatus

Also Published As

Publication number Publication date
GB8529522D0 (en) 1986-01-08
JPS62196166A (ja) 1987-08-29
DE3669688D1 (de) 1990-04-26
GB2183771B (en) 1990-05-16
GB2183771A (en) 1987-06-10
EP0227251A3 (en) 1988-02-03
US4804285A (en) 1989-02-14
EP0227251B1 (de) 1990-03-21

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